When hydrogen reacts with chlorine, the only product is hydrochloric acid. if 18g of hydrogen react completely with 633 g of chlorine, how many grams of hydrochloric acid are formed? (include units) 651 g when methane reacts with oxygen, the products are carbon dioxide (co2) and water (h2o). how many grams of water are formed if 24g of methane react completely with 96g of oxygen to form 66g of carbon dioxide? (include units)

The answer to your questions is:

a)  651 g of HCl

b)   54 g of water

Explanation:

a)                H₂   +    Cl₂    ⇒   2 HCl

MW H2 = 2 g

MW Cl2 = 70

MW HCl = 36

                 H₂   +    Cl₂    ⇒   2 HCl

                 2g        70             2(36)

                            633     x

                  x = 633(72)/70 = 651.1 g

b) MW CH₄ = 16 g

   MW O₂ = 32 g

  MW CO₂ = 44 g

  MW H₂O = 18 g

                 CH₄   +  4O₂    ⇒    CO₂    +   2H₂O

                 16g        64g          44g          36g

                  24g       96g         66g            x

                64g O2   36 g H2O

                96g O2     x

                   x = 96(36)/64 = 54 g of water

the number of valence electrons for each molecule or ion is shown beneath the structure. remember hydrogen will not have more than two electrons. this hydrogen is part of a covalent bond (sharing two electrons). a double bond here would cause hydrogen to share four electrons with phosphorus.